Discrimination of Transformer Excitation Surge Current Based on Time Domain Property of Equivalent Instant Excitation Inductance
JIAO Shao-ling~1, HUANG Minghui~1, XIAO Shiwu~2, LIU Wanshun~2 (1. Guangdong Electric Power Dispatching Center, Guangdong 510600,China; 2. Sifang Research Institute, Electric Power University of North China, Beijing 102206,China)
According to the mechanism of producing transformer excitation surge current caused by saturation of transformer core, the paper put forward a kind of method to discriminate excitation surge current and short-circuit current adopting calculation of equivalent instant excitation inductance average value. The results of theory analysis, EMTP simulation and TEQSIM mixed simulation show that the principles of this algorithm are distinct, transformer parameters cannot be considered, it can realize the identification of turn to turn light shortcircuit.
【CateGory Index】： TM401.1